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Posted by Jim on January 19, 2002 at 14:31:15:
In Reply to: VFD's and Chillers posted by Brian on December 21, 2001 at 11:15:20:
: What I would like to know is.. What is the affect of a variable frequency drive chilled water pump for a centrifugal chiller? The VFD is actually used for load conditions on our systems in the main building.
This is a much debated topic. Make sure your chiller manufacture concurs with variable pumping.
The are some good articles on this subject, see
HPAC.com See "Variable Volume Pumping Fundamentals" "A check valve in the Chiller Bypass Line" "The dimise of the primary-secondary pumping paradigm for chill water plant design.